400747423 has 4 divisors (see below), whose sum is σ = 418171248. Its totient is φ = 383323600.

The previous prime is 400747397. The next prime is 400747441. The reversal of 400747423 is 324747004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400747423 - 2¹⁷ = 400616351 is a prime.

It is a super-2 number, since 2×400747423² = 321196994082281858, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400747453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8711878 + ... + 8711923.

It is an arithmetic number, because the mean of its divisors is an integer number (104542812).

Almost surely, 2^400747423 is an apocalyptic number.

400747423 is a deficient number, since it is larger than the sum of its proper divisors (17423825).

400747423 is a wasteful number, since it uses less digits than its factorization.

400747423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17423824.

The product of its (nonzero) digits is 18816, while the sum is 31.

The square root of 400747423 is about 20018.6768543778. The cubic root of 400747423 is about 737.2649358297.

The spelling of 400747423 in words is "four hundred million, seven hundred forty-seven thousand, four hundred twenty-three".